Document the DSI panel enable / disable sequences from the spec, for easy comparison between the code and the spec. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> --- drivers/gpu/drm/i915/intel_dsi.c | 64 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 2222229..85b748d 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -555,6 +555,70 @@ static void intel_dsi_prepare(struct intel_encoder *intel_encoder, struct intel_crtc_state *pipe_config); static void intel_dsi_unprepare(struct intel_encoder *encoder); +/* + * Panel enable/disable sequences from the spec: + * + * v2 sequence for video mode: + * - power on + * - wait t1+t2 + * - MIPIDeassertResetPin + * - clk/data lines to lp-11 + * - MIPISendInitialDcsCmds + * - turn on DPI + * - MIPIDisplayOn + * - wait t5 + * - backlight on + * ... + * - backlight off + * - wait t6 + * - MIPIDisplayOff + * - turn off DPI + * - clk/data lines to lp-00 + * - MIPIAssertResetPin + * - wait t3 + * - power off + * - wait t4 + * + * v3 sequence for video mode: + * - MIPIPanelPowerOn + * - MIPIDeassertResetPin + * - set clk/data lines to lp-11 + * - MIPISendInitialDcsCmds (LP) + * - turn on DPI + * - MIPITearOn (command mode only) + MIPIDisplayOn (LP and HS) + * - MIPIBacklightOn + * ... + * - MIPIBacklightOff + * - turn off DPI + * - MIPITearOff + MIPIDisplayOff (LP) + * - clk/data lines to lp-00 + * - MIPIAssertResetPin + * - MIPIPanelPowerOff + * + * sequence for command mode: + * - power on + * - wait t1+t2 + * - MIPIDeassertResetPin + * - clk/data lines to lp-11 + * - MIPISendInitialDcsCmds + * - MIPITearOn + * - MIPIDisplayOn + * - set pipe to dsr mode + * - wait t5 + * - backlight on + * ... issue write_mem_start/write_mem_continue commands ... + * - backlight off + * - wait t6 + * - disable pipe dsr mode + * - MIPITearOff + * - MIPIDisplayOff + * - clk/data lines to lp-00 + * - MIPIAssertResetPin + * - wait t3 + * - power off + * - wait t4 + */ + static void intel_dsi_pre_enable(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config, struct drm_connector_state *conn_state) -- 2.9.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
